Fwiw, this error being spammy is what lead me to investigate and land#62596.
I see some kind of value of it being spammy, it's a huge FIXME.

@JeanMeche that’s a fair point. I think one motivation for making it less spammy is that I would actually encourage and expect more Zoneless tests during migration (or even not).

With Zoneless becoming the default, it may be that only a few tests truly need to test something specific to the ZoneJs integration but the rest can/should potentially operate in Zoneless mode by default but not necessarily require two splitting those out into a different test target.

I also don’t think the original intent was to log on every test execution but for it to log once on app load.

I could see this both ways though…